[Choroid plexus metastasis of renal cell carcinoma causing intraventricular hemorrhage: a case report].

We report a rare case of choroid plexus metastasis of renal cell carcinoma causing intraventricular hemorrhage. A 75-year-old female was admitted to our hospital for SAH. Preoperative examination evoked suspicion of an anterior communicating aneurysm as a cause of SAH. Furthermore, there were lesions on the tuberculum sellae and in the left trigone of the lateral ventricle, which were enhanced by Gd-DTPA on MRI. The patient was operated on via the pterional approach on December 3, 1996, but no aneurysm was found. She underwent total removal of the tuberculum sellae mass, which was postoperatively proved to be a meningioma by histological examination. The intraventricular tumor was supposed to be a meningioma, but it was not treated surgically. Two months later, the patient presented hematuria and was diagnosed as having a right renal cancer and underwent right nephrectomy on March 18, 1997. However, postoperatively, disturbance of consciousness continued. A CT scan revealed intraventricular hemorrhage around the tumor in the trigone of the lateral ventricle on March 21. An emergency operation for tumor and clot removal succeeded in improving the patient's condition. Histological examination of the tumor revealed clear-cell type renal cell carcinoma. Solitary choroidal plexus metastasis from renal cell carcinoma is quite rare: only 5 cases have been reported. But only our case was accompanied by intraventricular hemorrhage. Renal cell carcinomas are divided into two types: a slowly progressive type and a rapidly progressive type. Four cases among the reported 5 cases were the slowly progressive type, and our case was regarded as being of the same type.